London ? The United States is preparing to reject new targets on climate change at a Group of Eight summit next month, dashing German and British hopes for a new global pact on carbon emissions, according to a document released by environmentalists.

The White House said Saturday that discussions are still under way about what G-8 leaders will announce. “Our challenge and opportunity is in developing an approach that is appropriate and conducive to all these major emitting countries,” White House deputy press secretary Dana Perino said.

German Chancellor Angela Merkel, holding the rotating presidency of both the G-8 bloc of industrialized nations and the European Union, wants the June meeting to agree to targets for cuts in greenhouse gas output and a timetable for a major agreement on emissions reduction to succeed the Kyoto Protocol.